feat: multiple category feature

src/types/svg.ts

@@ -1,9 +1,12 @@
 import type { tCategory } from './categories';
 
+type tCategoryPair = [tCategory, tCategory];
+type CategoryTriple = [tCategory, tCategory, tCategory];
+
 export interface iSVG {
   id?: number;
   title: string;
-  category: tCategory;
+  category: tCategory | tCategoryPair | CategoryTriple;
   route:
     | string // for backwards compat of when theme support was not added
     | {